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A Mouse Ear Model for Bystander Studies Induced by Microbeam Irradiation.
M Buonanno1, G Randers-Pehrson1, L B Smilenov2
1a Radiological Research Accelerator Facility, Columbia University, Irvington, New York 10533;
Radiation Research
|July 25, 2015
Summary
This study shows radiation-induced bystander effects in a living mouse model. Microbeam irradiation caused DNA damage beyond the direct irradiation zone in skin cells.
Area of Science:
- Radiation biology
- In vivo studies
- Mammalian models
Background:
- Radiation-induced bystander effects are well-documented in vitro but understudied in vivo.
- Investigating these effects in a whole organism is crucial for understanding radiation responses.
Purpose of the Study:
- To investigate radiation-induced bystander effects in vivo using microbeam irradiation in a living mammal.
- To establish a mammalian model for studying these effects.
Main Methods:
- Utilized a 3 MeV proton microbeam to irradiate the mouse ear.
- Employed immunohistochemical analysis of gamma-H2AX foci to detect DNA damage.
- Developed a custom holder for precise irradiation of the mouse ear in vivo.
Main Results:
- Proton microbeam irradiation induced gamma-H2AX foci in mouse ear keratinocytes.
- DNA damage was observed in cells significantly wider than the direct irradiation path (~35 μm), exceeding 150 μm.
- No bystander effects were observed in adjacent or opposite epidermal layers.
Conclusions:
- This study demonstrates the first in vivo evidence of radiation-induced bystander effects using microbeam irradiation in a living mammal.
- The mouse ear model is validated as a suitable system for studying in vivo radiation-induced bystander effects.
